In　this　study,　we　aimed　to　enhance　the　quality　of　electrophoretic　deposition　(EPD)　coatings　for　Nd-Fe-B　grain　boundary　diffusion　(GBD)　by　addressing　issues　related　to　the　adhesion　and　densification　of　coating.　We　introduced　a　novel　approach　by　incorporating　polyvinyl　pyrrolidone　(PVP)　into　an　alcohol　suspension　containing　TbH3　nano-powders.　The　addition　of　PVP　resulted　in　the　formation　of　a　dense　coating　with　superior　adhesion　and　a　smooth　surface.　To　evaluate　the　effectiveness　of　the　EPD　coating　with　PVP,　we　compared　the　EPD　rate　of　the　TbH3　nano-powders　alcohol　suspension　with　and　without　PVP.　The　EPD　rate　of　the　suspension　with　PVP　exhibited　a　significant　30-fold　increase　compared　to　the　suspension　without　PVP,　indicating　a　substantial　improvement　in　the　electrophoretic　efficiency.　Based　on　our　experimental　findings,　we　recommend　depositing　the　EPD　coating　at　a　voltage　of　120　V　and　adjusting　the　deposition　time　accordingly　to　achieve　a　desired　coating　weight　percentage　of　1.0　wt%　with　a　thickness　of　approximately　30　mu　m.　Following　the　GBD　process,　the　coercivity　of　the　magnet　with　PVP　increased　from　1131　kA/m　to　1896　kA/m,　which　improved　the　high-temperature　stability　of　the　magnet.　Overall,　our　research　offers　a　promising　approach　to　overcome　the　limitations　associated　with　EPD　coatings　for　GBD　applications,　providing　a　potential　solution　for　enhancing　the　performance　and　industrial　viability　of　these　coatings.